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Old fuel left in the trimmer's tank may partially evaporate, leaving a sticky substance that clogs the carburetor, eventually preventing the trimmer from starting. Instead of replacing the carburetor as a first measure, try cleaning it with acarburetor cleaner. You may also need toadjust the car...
Insert the locking pin into the hole in the gear housing to lock the gears in place. The locking pin is a small steel rod that will fit in a hole on the gear housing above the lower head. With the gear housing in a lock position, turn the lower portion of the head counter-clockwise...